VALCO 6-1/2 INCH, 3-1/2 API, 600 SERIES TCI TRICONE HDD USED-NO FAILED BEARINGS
Used, but very well working order 6-1/2 Inch Valco Tricone bit. 600 Series for medium rock hardness. Bearings are SUPER TIGHT but do spin by hand if enough force is used. 3-1/2 API Regular Thread.